Cap for projectiles.



L. D. DE LANNEAU.

GAP FOR PROJEOTILES.

- rum-non FILED AUG. 22, 1908.

- Patented Apr. 20, 1909. l

SLE'MJS MQW SAT S AT T car FOB PROJEGTIVLES.

Specification of Letters Patent.

Patented April 20, 1909.

Application filed August 22, 1908. Serial No. 449,826.

, To all whom it may concern:

Be it known that I, Liion DUVIGN U on LANNEAU, of the Republic of France, residing at 71 Boulevard Pereire, Paris, France, have invented new and useful Improvements in Caps for Projectiles, of which the follow? ing is a specification.

The present invention has for its object a rigid form of cap intended for preserving the fuses of projectiles.

There are in existence protecting devices constituted by acap of soft metal such as lead. Their defects are known: On the one hand they are wanting in strength, while on the other hand they do not form a perfect joint where the tearing-oil" wire passes, and finally they leave residues of metal in the fuse-regulating appliances. Attempts have been made to obviate these defects by using a complex rigid cap, comprising a lower cup fixed to the fuse and which is torn off, for

the purpose of removing the cap, by means of a tearing-off wire; the cap proper being closed over upon the edges of this cup with the intermediary of a joint. 'Apart from its complexity, high cost and the difliculty of forming a tight joint owing to the multiplicity of joints, this method of capping presents the defect of necessitating a tear-ofi' wire like a lead cap and where this .wire passes through the joint-is necessarily defective. In addition to this, the severing of the cup by means of the tear-off wire is an operation attended with considerable difficulty and occupies too much time to be satisfactory with quickfire guns.

j The novel method ofcapping consists in principle of a rigid metal cap, in a single piece, provided with an external tear-oft collar or projection, formed with the said cap or firmly fitted to it; the lower edge of this cap is fixed, by closing over or crimping, into or beneath a groove or shoulder formed for that purpose either upon the ogive of the projectile or upon the plate of the fuse, or finally on a ring clamped or fixed between the projectile and the fuse.

The accompanyingdrawing shows, by way of example, various embodiments of the invention.

In the embodiment illustrated in Figure 1, a designates the upper part of the ogive of a projectile and I) is the fuse. The capping is effected by means of a rigid metal cap 0 shaped in such a manner as to present at an appropriate point a supporting collar for a tearing off tool. The collar 0 for the engagement of the cap 0 is formed at the summitof the ogive. It is upon this collar that the lower edge f of the cap is engaged. The cap presents a shoulder g which bears upon the upper part it of said collar 6.

In the example illustrated in Fig. 2, the collar d is formed by a ring fitted and brazed to the cap proper c. The engaging shoulder projects from the plate of the fuse Z).

In the construction illustrated in Fig. 3, the engaging shoulder e is constituted by the salient edgeof a metal ring pressed home between the fuse b and the ogive a.

In the example illustrated in Fig. 4, the lower edge f of the capsule is lodged in a groove 6 formed on the edge of the ogive and which leaves upon the latter a circular tongue at sufliciently yielding to permit of being closed over by pinching the said edge In the example illustrated in Figs. 1, 2 and 3, a tight joint is obtained in the following manncr. The contacting parts of the cap 0 and of the engaging shoulder e are lightly coated with varnish or paint before the cap is arranged in position; this coat should not be sufiicient to foul the regulating appliances of the fuse. After the envelop has been fitted, the joint with the projectile is covered with a layer of varnish or paint which still further insures a good joint. 7

In the example illustrated in Fig. 4 the walls of the groove 6 are coated with varnish or paint before the cap is arranged in place.

It will be seen that in all cases the device comprises but a single joint between the cap and the projectile and that this joint can be rendered perfectly tight.

Q11 firing, the envelop is torn away by means of a key or a pivoting device.

hat I claim and desire to secure by Letters Patent of the United States is 1. As a new article of manufacture, a cap to protect the fuses of projectiles, formed of a single piece of metal united at one end to the projectile and provided with a shoulder to be engaged by asuitable decapping implement, substantially as described.

2. As a new article of manufacture, a cap to protect the fuses of projectiles, formed of a single piece of rigid metal united at its lower end to the projectile and having by a suitable decapping implement, sub- 10 its surface provided with a shoulder to be stantially as described. q engaged by a suitable decapping implement, In testimony whereof I have signed my substantially as described. v name to this specification in the presence of 3. In combination, a projectile having two subscribing Witnesses. means for engaging a cap, a rigid one piece LEON DUVIGNAU DE LANNEAU. metal cap having means for engaging the \Vitnesses: said engaging means of the projectile, and EMILE BERT, a shoulder on the cap adapted to be engaged H. C. CoXE. 

